Microsoft.CSharp.sln fails to build with msbuild (v14.0.24720.0) with following error:

Solution file error MSB5004: The solution file has two projects named "Microsoft_CSharp".

On the other hand, Visual Studio builds the solution successfully.

Looking at the solution file, the error seems to be that both Microsoft.CSharp.csproj and Microsoft.CSharp.Tests.csproj are named "Microsoft.CSharp" in the solution file.

I will submit a pull request to fix the name shortly, but I also have a question: How come automated testing didn't reveal this issue?